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via minecraftforge.net by Unknown author, 1 year ago
java.lang.NullPointerException: 	at undefined.PC_InvUtils.groupStacks(PC_InvUtils.java:528)	at undefined.PCma_BlockHarvester.harvestBlocks(PCma_BlockHarvester.java:227)	at undefined.PCma_BlockHarvester.a(PCma_BlockHarvester.java:171)	at undefined.xd.a(World.java:3392)	at undefined.xd.c(World.java:2726)	at net.minecraft.client.Minecraft.k(Minecraft.java:1877)	at net.minecraft.client.Minecraft.x(Minecraft.java:825)	at net.minecraft.client.Minecraft.run(Minecraft.java:753)	at java.lang.Thread.run(Unknown Source)